IOWA ACADEMY OF SCIENCES. 
101 
water bath to 40 or 50 degrees. During the reduction the 
solution was sky blue, but when complete it usually 
changed to a pinkish color. The end of the reaction was 
determined by taking a test portion and diluting with sev- 
eral times its own volume of water. If any unreduced 
ether was present it would be precipitated, forming a 
white turbidity. The tin was removed from the solution 
by means of hydrogen sulphide and, on concentration on 
the water bath, the hydrochloride crystallized out in white 
needles, which were very stable when dry, but unstable in 
contact with water. The hydrochloride melts at 220 0 C. 
It is somewhat soluble in hot, but much less soluble in 
cold water, and insoluble in organic solvents in general. 
The constitution of the compound was ascertained by 
determining the platinum in the platinum salt, as given 
below. 
An attempt to prepare the free base by precipitating it 
with an alkaline hydroxide from a water solution of the 
hydrochloride proved unsuccessful. It decomposed in the 
bell jar over sulphuric acid before it could be thoroughly 
dried. 
4-Methyl-2 -amido phenyl ether chlor-platinate — — 
(CH 3 .C 6 H 4 0C 6 H 4 .NH 2 ) 2 .H 2 PtCl 6 -(-Hn 2 0 The platinum salt 
was prepared by precipitating the amido hydrochloride in 
water solution with clilor platinic acid. It is of a greenish 
yellow color and melts with decomposition at 150 °C. The 
salt was dried for several days over sulphuric acid and 
then in the air bath at 100-110° C for three or four hours 
when it lost weight corresponding to one and one-half 
molecules of water. On being heated it assumes a much 
deeper tint, but on coming in contact with the air again it 
acquires its original color. It is very hygroscopic and 
gains weight very rapidly while being weighed. An 
analysis resulted as follows: 
Calculated for (CisHiaNO^.HsPtCleqd^lLO Found. 
Platinum 24.1 percent 24.1 percent. 
Loss of water 3.23 3.03 
A further study of diphenyl ether derivatives is being 
carried on in the chemical laboratory of Morningside Col- 
